Add DSC v3 resource discovery support in PowerToys with subfolder structure and PATH configuration (#43253)

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## Summary of the Pull Request

- Use DSCModules subfolder for JSON manifest files
- Use relative path "..\PowerToys.DSC.exe" in JSON manifests
- Configure PATH environment variable to point to DSCModules subfolder

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## PR Checklist

- [ ] Closes: #xxx
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed

installer/PowerToysSetupCustomActionsVNext/PowerToysSetupCustomActionsVNext.vcxproj

@@ -54,6 +54,7 @@
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\CmdPal.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\CmdPal.wxs.bk""""
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\ColorPicker.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\ColorPicker.wxs.bk""""
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\Core.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\Core.wxs.bk""""
+      call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\DscResources.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\DscResources.wxs.bk""""
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\EnvironmentVariables.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\EnvironmentVariables.wxs.bk""""
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\FileExplorerPreview.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\FileExplorerPreview.wxs.bk""""
       call cmd /C "copy ""$(ProjectDir)..\PowerToysSetupVNext\FileLocksmith.wxs"" ""$(ProjectDir)..\PowerToysSetupVNext\FileLocksmith.wxs.bk""""